Gas-engine valve.



C. H. PARKER.

GAS'ENGINE VALVE.

APucATiou FILED MAR. 25. 1912. 1 13 7 8999 Patented May 4, 1915. 2 SHEETS-SHEET 1.

22v? 27 3 am A TTOFRNE Y5 C. H PARKER.

GAS ENGINE VALVE. APPLICATION man MAR. '25. 1912. 1,137,89Q Patented May 4k, i915.

' 2 SHEETS-SHEET 2 A T TOE/V5.75

CLARK H. PARKER, OF BEAVER DAM, WISCONSIN.

caries.

GAS-ENGINE VALVE.

iaaaseo.

Application filed March 25, 1912.

To all whom it may concern i Be 1t known that I, CLARK H. PARKER, a

citizen of the United States, and resident of Beaver Dam, in the county of Dodge and State of lVisconsin, have invented new and useful Improvements in Gas-Engine Valves,

of whichthe following is a description, reference being had to the accompanying drawings, which are a part of this specification.

This invention has for its object to provide a rotary valve mechanism for gas engines and to protect the same by means of a puppet valve against the burning gases at the time of the explosion.

' With the above and other objects in view the invention consists in the gas engine valve as herein claimed and all equivalents.

Referring to the accompanying drawings in which like characters of reference indicate the same parts in the different views: Figure 1 is a front elevation of a gas engine provided with a valve mechanism constructed in accordance with this invention; Fig. 2 is a sectional elevation through one of the cylinders thereof; Fig 3 is a similar view on a plane at right angles to the sectional plane of Fig. 2; Fig. 4 is a detail view of the protecting valve and its operating cam; and, Fig. 5 is a similar view of a modified form of construction in which the protecting valve is operated by means of an cecentric.

In. these drawings 10 indicates the cylinders of a gas engine, 11 being the crank shaft thereof carrying the fly wheel 12 as usual and provided with a sprocket wheel 13 which is connected with a sprocket wheel 14 of twice its diameter by means of a chain. 15. The sprocket wheel 11 is mounted on a valve shaft 16 which is journaled in the upper ends of the cylinders and is formed in sections, one section being provided for each bank of cylinders and the sections being connected together by means of couplings 17. Each cylinder has a single valve seat 18 in its upper end which constitutes a communication betwecn the interior of the cylinder and a chamber 19 above it. The chamber 19 has an intakepassageway 20 and an exhaust passageway 21 connecting therewith, but the valve shaft 16 is positioned at the junction of these passageways where they communicate with thechamber 19 and is adapted to intercept the communication between them. This valve shaft 16, however, is provided with a cavity or recess 22 which during the Specification of Letters Patent.

Patented May a, 1915..

Serial No. 685,968.

turning movements of the valve shaft may connect the chamber 19 with either the intake passageway or the exhaust passageway.

A protecting valve 23 has its stem 24 slidably mounted through the cylinder head and is capable of fitting on the valve seat 18 to close the communication between the interior of the cylinder and the chamber 19. A spring 25 surrounding the valve stem and engaging a disk 26 on its upper end serves to normally hold the protecting valve 23 closed. A rock shaft 27 is journaled in brackets 28 on the cylinder head and with the multiple cylinder construction shown in Fig. 1 is surrounded by a sleeve 29 where it passes through one of the brackets. An arm 30 is mounted on one end of the rock shaft 27 and another is mounted on that end of the sleeve 29 and each of these arms carries a roller 31 to engage a cam 32 on valve shaft 16, there beingone of said cams for each of the arms 30. The other ends of the rock shaft 27 and the sleeve 29 are provided with arms with set screws 34 in their ends engaging the valve stems 24 of the respec tive protecting valves 23 of the two cylinders of that bank. The enlarged portion of the cam 32 extends for practically one half of the circumference thereof so that the position in which the rock shaft is held by the engagement of such enlarged portion with the roller 31 serves to hold the protecting valve 23 off of its seat for one half of the revolution of the valve shaft 16 which is equivalent to one complete revolution of the crank shaft 11 of the engine.

Tn operation cavity 22 of the valve shaft 16 is in position to connect the chamber '19 of each cylinder with the exhaust port during the exhaust stroke of the piston in that cylinder and turns to the position for con necting said chamber 19 with the intake passageway during the suction stroke of the piston, the protecting valve 23 being held off of its seat in the position shown in Fig. 2 during both of such strokes of the piston or throughout the one complete revolution of the crank shaft of the engine. During the succeeding revolution of the crank shaft of the engine the protecting valve 23 remains closed so that the compression stroke and the explosion stroke of thepiston are performed without the cylinder having communication with the chamber '19 and consequently the valve shaft 16 and the passageways controlled by it are protected by the valve 23 ing the explosion and do not interfere with the proper compression of the charge. Inasmuch as the cam 32 is effective throughout one half of the revolution of the valve shaft it is obvious that an eccentric ma be substituted therefor and such modi cation is illustrated in Fig. 5 where the eccentric 32 on the valve shaft l6 is surrounded by an eccentric strap 81" connected with the arm on the rock shaft 27.

By means of this invention the necessity for a separate intake and exhaust port communicating with the cylinder is dispensed with, the one opening serving the purpose for both intake and exhaust and it is not necessary for the piston to overcome the pressure of a check valve in drawing in its charge but free and unobstructed communication is established from the carbureter to the cylinder during the intake stroke and still there is double protection against the explosive force being vented through the carbureter by the closing of the protecting valve 23 as well as the closing of the intake passageway by the valve shaft16at the time of the explosion.

By employing one port for use as the intake and the exhaust port the device is given the tendency to lower the temperature of valves and passages or ports, overcoming a common fault in other engines whichemploy separate ports and valves which let all of the heat and fire out through one valve to cause overheating and burning of the valve. Furthermore the single port and valve beingwarmed by the exhaust passing therethrough serves to heat the incoming charge and efiects a better mixture thereof.

What I claim as new and desire to secure by Letters Patent is:

A. four cylinder four cycle gas engine, comprising the combination with the cylinders provided with-cylinder heads each having a single valve seat, spring pressed protecting puppet valves fitting on said valve seats, a chamber in each cylinder head communicating with the interior of the cylinder through the valve seat, there being intake and exhaust passageways communicating with the chamber, connected valve shaft sections ournaled in the cylinder heads of cylinders at the intersection of the intake-and exhaust passageways 'with said chambers and provided with cavities for establishing communication between said chambers and the intake and exhaust passageways, a driving connection between the valve shaft and the crank shaft of the engine, brackets on the cylinders, rock shafts journaled in the brackets, a sleeve surrounding each rock shaft, cams on the valve shaft sections, arms on the rock shafts and sleeves respectively engaging the cams, and arms on the rock shafts and sleeves respectively engaging the protecting puppet valve.

In testimony whereof; I atfix my signature, in presence of two witnesses.

CLARK PrtifthlEl t. Witnesses J. L. MILTGEN, GEO. SAGE. 

